[cfe] Handle member access on extension type receivers This updates the handling of member access on extension type receivers to use the added `nonTypeVariableBound` and the `hasNonObjectMemberAccess` properties. The `nonTypeVariableBound` replaces the `resolveTypeParameterType`, updated to taking the nullablity into account when going through type variable bounds. Change-Id: Ia2eb115c208350cdf011948177b15ebbc984fcac Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/333540 Reviewed-by: Srujan Gaddam <srujzs@google.com> Reviewed-by: Chloe Stefantsova <cstefantsova@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>
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